import intersperse from 'intersperse'
import PropTypes from '../_util/vue-types'
import classNames from 'classnames'
import find from 'lodash/find'
import Row from '../grid/Row'
import Col, { ColProps } from '../grid/Col'
import warning from '../_util/warning'
import { FIELD_META_PROP, FIELD_DATA_PROP } from './constants'
import { initDefaultProps, getComponentFromProp, filterEmpty, getSlotOptions, isValidElement, getAllChildren } from '../_util/props-util'
import getTransitionProps from '../_util/getTransitionProps'
import BaseMixin from '../_util/BaseMixin'
import { cloneElement, cloneVNodes } from '../_util/vnode'
import Icon from '../icon'

export const FormItemProps = {
  id: PropTypes.string,
  prefixCls: PropTypes.string,
  label: PropTypes.any,
  labelCol: PropTypes.shape(ColProps).loose,
  wrapperCol: PropTypes.shape(ColProps).loose,
  help: PropTypes.any,
  extra: PropTypes.any,
  validateStatus: PropTypes.oneOf(['', 'success', 'warning', 'error', 'validating']),
  hasFeedback: PropTypes.bool,
  required: PropTypes.bool,
  colon: PropTypes.bool,
  fieldDecoratorId: PropTypes.string,
  fieldDecoratorOptions: PropTypes.object,
}

export default {
  name: 'AFormItem',
  __ANT_FORM_ITEM: true,
  mixins: [BaseMixin],
  props: initDefaultProps(FormItemProps, {
    hasFeedback: false,
    prefixCls: 'ant-form',
    colon: true,
  }),
  inject: {
    FormProps: { default: {}},
    decoratorFormProps: { default: {}},
  },
  data () {
    return { helpShow: false }
  },
  mounted () {
    warning(
      this.getControls(this.slotDefault, true).length <= 1,
      '`Form.Item` cannot generate `validateStatus` and `help` automatically, ' +
      'while there are more than one `getFieldDecorator` in it.',
    )
    warning(
      !this.fieldDecoratorId,
      '`fieldDecoratorId` is deprecated. please use `v-decorator={id, options}` instead.'
    )
  },
  methods: {
    getHelpMessage () {
      const help = getComponentFromProp(this, 'help')
      const onlyControl = this.getOnlyControl()
      if (help === undefined && onlyControl) {
        const errors = this.getField().errors
        if (errors) {
          return intersperse(errors.map((e, index) => {
            return isValidElement(e.message) ? cloneElement(e.message, { key: index }) : e.message
          }), ' ')
        } else {
          return ''
        }
      }

      return help
    },

    getControls (childrenArray = [], recursively) {
      let controls = []
      for (let i = 0; i < childrenArray.length; i++) {
        if (!recursively && controls.length > 0) {
          break
        }

        const child = childrenArray[i]
        if (!child.tag && child.text.trim() === '') {
          continue
        }

        if (getSlotOptions(child).__ANT_FORM_ITEM) {
          continue
        }
        const children = getAllChildren(child)
        const attrs = child.data && child.data.attrs || {}
        if (FIELD_META_PROP in attrs) { // And means FIELD_DATA_PROP in child.props, too.
          controls.push(child)
        } else if (children) {
          controls = controls.concat(this.getControls(children, recursively))
        }
      }
      return controls
    },

    getOnlyControl () {
      const child = this.getControls(this.slotDefault, false)[0]
      return child !== undefined ? child : null
    },

    getChildAttr (prop) {
      const child = this.getOnlyControl()
      let data = {}
      if (!child) {
        return undefined
      }
      if (child.data) {
        data = child.data
      } else if (child.$vnode && child.$vnode.data) {
        data = child.$vnode.data
      }
      return data[prop] || data.attrs[prop]
    },

    getId () {
      return this.getChildAttr('id')
    },

    getMeta () {
      return this.getChildAttr(FIELD_META_PROP)
    },

    getField () {
      return this.getChildAttr(FIELD_DATA_PROP)
    },

    onHelpAnimEnd  (_key, helpShow) {
      this.helpShow = helpShow
      if (!helpShow) {
        this.$forceUpdate()
      }
    },

    renderHelp () {
      const prefixCls = this.prefixCls
      const help = this.getHelpMessage()
      const children = help ? (
        <div class={`${prefixCls}-explain`} key='help'>
          {help}
        </div>
      ) : null
      if (children) {
        this.helpShow = !!children
      }
      const transitionProps = getTransitionProps('show-help', {
        afterEnter: () => this.onHelpAnimEnd('help', true),
        afterLeave: () => this.onHelpAnimEnd('help', false),
      })
      return (
        <transition
          {...transitionProps}
          key='help'
        >
          {children}
        </transition>
      )
    },

    renderExtra () {
      const { prefixCls } = this
      const extra = getComponentFromProp(this, 'extra')
      return extra ? (
        <div class={`${prefixCls}-extra`}>{extra}</div>
      ) : null
    },

    getValidateStatus () {
      const onlyControl = this.getOnlyControl()
      if (!onlyControl) {
        return ''
      }
      const field = this.getField()
      if (field.validating) {
        return 'validating'
      }
      if (field.errors) {
        return 'error'
      }
      const fieldValue = 'value' in field ? field.value : this.getMeta().initialValue
      if (fieldValue !== undefined && fieldValue !== null && fieldValue !== '') {
        return 'success'
      }
      return ''
    },

    renderValidateWrapper (c1, c2, c3) {
      const props = this.$props
      const onlyControl = this.getOnlyControl
      const validateStatus = (props.validateStatus === undefined && onlyControl)
        ? this.getValidateStatus()
        : props.validateStatus

      let classes = `${props.prefixCls}-item-control`
      if (validateStatus) {
        classes = classNames(`${props.prefixCls}-item-control`, {
          'has-feedback': props.hasFeedback || validateStatus === 'validating',
          'has-success': validateStatus === 'success',
          'has-warning': validateStatus === 'warning',
          'has-error': validateStatus === 'error',
          'is-validating': validateStatus === 'validating',
        })
      }
      let iconType = ''
      switch (validateStatus) {
        case 'success':
          iconType = 'check-circle'
          break
        case 'warning':
          iconType = 'exclamation-circle'
          break
        case 'error':
          iconType = 'close-circle'
          break
        case 'validating':
          iconType = 'loading'
          break
        default:
          iconType = ''
          break
      }
      const icon = (props.hasFeedback && iconType)
        ? <span class={`${props.prefixCls}-item-children-icon`}>
          <Icon type={iconType} theme={iconType === 'loading' ? 'outlined' : 'filled'} />
        </span> : null
      return (
        <div class={classes}>
          <span class={`${props.prefixCls}-item-children`}>
            {c1}{icon}
          </span>
          {c2}{c3}
        </div>
      )
    },

    renderWrapper (children) {
      const { prefixCls, wrapperCol = {}} = this
      const { class: cls, style, id, on, ...restProps } = wrapperCol
      const className = classNames(
        `${prefixCls}-item-control-wrapper`,
        cls,
      )
      const colProps = {
        props: restProps,
        class: className,
        key: 'wrapper',
        style,
        id,
        on,
      }
      return (
        <Col {...colProps}>
          {children}
        </Col>
      )
    },

    isRequired () {
      const { required } = this
      if (required !== undefined) {
        return required
      }
      if (this.getOnlyControl()) {
        const meta = this.getMeta() || {}
        const validate = meta.validate || []

        return validate.filter((item) => !!item.rules).some((item) => {
          return item.rules.some((rule) => rule.required)
        })
      }
      return false
    },

    // Resolve duplicated ids bug between different forms
    // https://github.com/ant-design/ant-design/issues/7351
    onLabelClick (e) {
      const label = getComponentFromProp(this, 'label')
      const id = this.id || this.getId()
      if (!id) {
        return
      }
      const controls = document.querySelectorAll(`[id="${id}"]`)
      if (controls.length !== 1) {
        // Only prevent in default situation
        // Avoid preventing event in `label={<a href="xx">link</a>}``
        if (typeof label === 'string') {
          e.preventDefault()
        }
        const control = this.$el.querySelector(`[id="${id}"]`)
        if (control && control.focus) {
          control.focus()
        }
      }
    },

    renderLabel () {
      const { prefixCls, labelCol = {}, colon, id } = this
      const label = getComponentFromProp(this, 'label')
      const required = this.isRequired()
      const { class: labelColClass, style: labelColStyle, id: labelColId, on, ...restProps } = labelCol
      const labelColClassName = classNames(
        `${prefixCls}-item-label`,
        labelColClass,
      )
      const labelClassName = classNames({
        [`${prefixCls}-item-required`]: required,
      })

      let labelChildren = label
      // Keep label is original where there should have no colon
      const haveColon = colon && this.FormProps.layout !== 'vertical'
      // Remove duplicated user input colon
      if (haveColon && typeof label === 'string' && label.trim() !== '') {
        labelChildren = label.replace(/[：|:]\s*$/, '')
      }
      const colProps = {
        props: restProps,
        class: labelColClassName,
        key: 'label',
        style: labelColStyle,
        id: labelColId,
        on,
      }

      return label ? (
        <Col {...colProps} >
          <label
            for={id || this.getId()}
            class={labelClassName}
            title={typeof label === 'string' ? label : ''}
            onClick={this.onLabelClick}
          >
            {labelChildren}
          </label>
        </Col>
      ) : null
    },
    renderChildren () {
      return [
        this.renderLabel(),
        this.renderWrapper(
          this.renderValidateWrapper(
            this.slotDefault,
            this.renderHelp(),
            this.renderExtra(),
          ),
        ),
      ]
    },
    renderFormItem (children) {
      const props = this.$props
      const prefixCls = props.prefixCls
      const itemClassName = {
        [`${prefixCls}-item`]: true,
        [`${prefixCls}-item-with-help`]: this.helpShow,
        [`${prefixCls}-item-no-colon`]: !props.colon,
      }

      return (
        <Row class={classNames(itemClassName)}>
          {children}
        </Row>
      )
    },
    decoratorOption (vnode) {
      if (vnode.data && vnode.data.directives) {
        const directive = find(vnode.data.directives, ['name', 'decorator'])
        warning(
          !directive || (directive && Array.isArray(directive.value)),
          `Invalid directive: type check failed for directive "decorator". Expected Array, got ${typeof directive.value}. At ${vnode.tag}.`,
        )
        return directive ? directive.value : null
      } else {
        return null
      }
    },
    decoratorChildren (vnodes) {
      const { FormProps } = this
      const getFieldDecorator = FormProps.form.getFieldDecorator
      vnodes.forEach((vnode, index) => {
        if (vnode.children) {
          vnode.children = this.decoratorChildren(cloneVNodes(vnode.children))
        } else if (vnode.componentOptions && vnode.componentOptions.children) {
          vnode.componentOptions.children = this.decoratorChildren(cloneVNodes(vnode.componentOptions.children))
        }
        const option = this.decoratorOption(vnode)
        if (option && option[0]) {
          vnodes[index] = getFieldDecorator(option[0], option[1])(vnode)
        }
      })
      return vnodes
    },
  },

  render () {
    const { $slots, decoratorFormProps, fieldDecoratorId, fieldDecoratorOptions = {}, FormProps } = this
    let child = filterEmpty($slots.default || [])
    if (decoratorFormProps.form && fieldDecoratorId && child.length) {
      const getFieldDecorator = decoratorFormProps.form.getFieldDecorator
      child[0] = getFieldDecorator(fieldDecoratorId, fieldDecoratorOptions)(child[0])
      warning(
        !(child.length > 1),
        '`autoFormCreate` just `decorator` then first children. but you can use JSX to support multiple children',
      )
      this.slotDefault = child
    } else if (FormProps.form) {
      child = cloneVNodes(child)
      this.slotDefault = this.decoratorChildren(child)
    } else {
      this.slotDefault = child
    }

    const children = this.renderChildren()
    return this.renderFormItem(children)
  },
}